Empire in Black and Gold by Adrian Tchaikovsky (Shadows of the Apt)

The Lowlands' city states have lived in peace for decades, hailed as bastions of civilization. Yet that peace is about to end. A distant empire has been conquering neighbours with highly trained soldiers and sophisticated combat techniques. And the city states are its desirable new prize.

Only the ageing Stenwold Maker - spymaster, artificer and statesman - foresees the threat, as the empires' armies march ever closer. So it falls upon his shoulders to open the eyes of the cities' leaders. He sees that war will sweep through their lands, destroying everything in its path.

But to warn his people, he must stay alive.

Book by author Adrian Tchaikovsky,